//
//  NSString+HXMD5.m
//  24_加密
//
//  Created by 徐昊 on 16/8/16.
//  Copyright © 2016年 徐昊. All rights reserved.
//

#import "NSString+HXMD5.h"
#import <CommonCrypto/CommonCrypto.h>

@implementation NSString (HXMD5)
// 字符串 转换 32位 MD5字符串小写
- (NSString *)stringWith32BitMD5Lower {
    return [self stringWith32BitMD5];
}
- (NSString *)stringWith32BitMD5 {
    // 1. 将字符串转换成C语言字符串
    const char *cString = [self UTF8String];
    CC_LONG length = (CC_LONG)strlen(cString);
    unsigned char bytes[CC_MD5_DIGEST_LENGTH];
    // 2. 将C的字符串转换成 MD5
    CC_MD5(cString, length, bytes);
    // 3. 将C的字符串转换成OC的字符串
    NSMutableString *finalMD5String = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
        [finalMD5String appendFormat:@"%02x", bytes[i]];
    }
    return finalMD5String;
}
// 字符串 转换 32位 MD5字符串大写
- (NSString *)stringWith32BitMD5Upper {
    return [[self stringWith32BitMD5] uppercaseString];
}
- (NSString *)stringWith16BitMD5Lower {
    return [self stringWith16BitMD5];
}
- (NSString *)stringWith16BitMD5Upper {
    return [[self stringWith16BitMD5] uppercaseString];
}
- (NSString *)stringWith16BitMD5 {
    NSString *str = [self stringWith32BitMD5];
    str = [str substringToIndex:str.length - 8];
    str = [str substringFromIndex:8];
    return str;
}


@end
